That`s not spring boot, that`s whole spring (and google guice, etc), starting from the idiotic XML for bean wiring, to equally idiotic anntations, and finally, after 15 or how many years, they realized that plain java can be used for object creation. What a discovery! Still, they introduced @Configuration bullshit, etc.

(There are cases when such features may be useful, e. g. systems that are extended by 3rd party plugins, like Maven, although may be done without that as well).

For normall applications that´s nothing more than bloat and limitations. The problem that the majority of users follow cargo cults without understanding what are they doing. In result the ecosystem is full of bad practices.

AbstactArgumentBuilderFactoryFactory were in fashion for the same reason.

Otherwise Java is a neat little language and a good platform.